If you woke up today to your AI agents failing with the error message “Claude Opus 4.5 is no longer available. Please switch to Claude Opus 4.6,” do not panic. This is a scheduled depreciation by Anthropic that has just come into effect.
What Happened?
As part of their rapid release cycle in 2026, Anthropic has officially sunsetted the Claude Opus 4.5 API endpoints. This move is designed to push users toward the newly optimized Claude Opus 4.6, which offers significantly lower latency and improved reasoning capabilities for the same token cost.
How to Fix It
The fix depends on how you are consuming the model. Here is a guide for the most common setups:
1. For API Developers
You need to update the model parameter in your API calls. Search your codebase for the string claude-3-opus-4.5 (or similar, depending on your client) and replace it with:
model="claude-3-opus-4.6"2. For OpenClaw Users
If you are running the OpenClaw execution engine, your agent might be stuck trying to call the old model. You can fix this with a simple configuration command:
openclaw config set model claude-opus-4.6
# Or if you use aliases:
openclaw config set model claudeAlternatively, open your config.yaml or .env file and manually update the DEFAULT_MODEL variable.
3. For No-Code Platforms (Flowise, Zapier, etc.)
If you are using a drag-and-drop tool:
- Open your agent flow.
- Click on the ChatAnthropic or Model node.
- In the “Model Name” dropdown, you should now see Claude Opus 4.6. Select it and save your flow.
- Note: If you don’t see it, you may need to update your platform’s docker image or clear your browser cache.
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